What story is Princess Zhu Huan telling?

Wei Zi, the daughter of Ganlong, went to Beijing to meet her long-lost father. In desperation, I met the female snitch, Swallow, and became sisters. Swallow managed to blend into the palace for her, but mistakenly exchanged identities with Wei Zi, and became the "Pearl Princess" in the Qing Palace, which was deeply loved by Qianlong.